A quantity that measures the opposition to the flow of charge is
a. voltage.
b. current.
c. resistance.
d. electric field.
e. critical temperature.
c
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What percentage of a star's total lifetime is spent on the main sequence?
A) 100% B) 50% C) 90% D) 20% E) 10%
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
?
?
Use this exhibit to answer the following question(s).
Refer to . What is the magnitude of their velocity, in m/s, immediately after the collision?
a.
0
b.
13
c.
15
d.
26
e.
30
Capacitors in Combination: A potential difference of V = 100 V is applied across two capacitors in series, as shown in the figure. If C1 = 10.0 ?F and the voltage drop across it is 75 V, what is the capacitance of C2? 
A. 30 ?F B. 2.5 ?F C. 7.5 ?F D. 3.3 ?F
According to the ______________ theory, the universe began from a single point 13.7 billion years ago
Fill in the blank(s) with correct word